Exploration assignments today are more challenging than ever before. The emphasis is on smaller structures and more accurate and deeper interpretations. Many of the more difficult areas, formerly not considered amenable to geophysical exploration, reveal a similarity of problems in widely separated geological and geographical provinces. Geologists and geophysicists are continually broadening their viewpoints because they realize more and more that few areas are unique.Geophysics has made and is continuously making substantial contributions to basic geology. Exploration thinking is broadening steadily toward more definite evaluation of the many types of oil-bearing traps.Explorationists are learning the principles of sound business risk and thereby expanding their horizons by becoming good businessmen as well as highly trained specialists. The opportunity to expand our horizons further was never more promising than at the present.